SAQA All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.
SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD: 

Demonstrate an understanding of basic digital circuits 
SAQA US ID UNIT STANDARD TITLE
253074  Demonstrate an understanding of basic digital circuits 
ORIGINATOR
SGB Electronics 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 10 - Physical, Mathematical, Computer and Life Sciences Information Technology and Computer Sciences 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 3  NQF Level 03 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Reregistered  2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
This unit standard is applicable to people requiring basic knowledge of digital electronic components. The unit standard requires that learners attain a working knowledge of basic components, their functions, characteristics, ratings and applications. The handling of components will also be dealt with related to various basic digital circuits.

Learners accredited with this unit standard will be capable of:
  • Performing basic conversions of number systems and codes.
  • Identifying basic digital components and explaining the their basic operation.
  • Demonstrating an understanding of the electrical behaviour of CMOS devices.
  • Using Boolean algebra to simplify basic combinational circuits. 

  • LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    It is assumed that the learner is competent in:
  • Communication at NQF Level 2.
  • Mathematics at NQF Level 2. 

  • UNIT STANDARD RANGE 
    N/A 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Perform basic conversions of number systems and codes. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Conversions between different number bases are carried out in order to design digital systems. 
    ASSESSMENT CRITERION RANGE 
    Different number base include but are not limited to binary, octal, hexadecimal and decimal numbers and not limited to whole numbers.
     

    ASSESSMENT CRITERION 2 
    Addition and subtraction of binary numbers are carried out in order to design digital systems. 

    ASSESSMENT CRITERION 3 
    Multiplication and division of binary numbers are carried out in order to design digital systems. 

    ASSESSMENT CRITERION 4 
    Basic number system codes are described in terms of their function and application. 
    ASSESSMENT CRITERION RANGE 
    Basic codes include but not limited to 8421, 2421, BCD, ASCII, Gray, Excess-3 and Hamming codes.
     

    SPECIFIC OUTCOME 2 
    Identify and explain the basic operation of digital elements. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Logic levels "0" and "1" or "Low" and "High" are described in terms of voltage values including the undefined region. 

    ASSESSMENT CRITERION 2 
    Basic logic gates are represented symbolically and interpreted in terms of their electrical equivalent circuits. 
    ASSESSMENT CRITERION RANGE 
    Basic logic gates include but not limited to AND, NOT, NOR, OR, EXOR gates.
     

    ASSESSMENT CRITERION 3 
    Truth tables are drawn from a combination of logic gates to simplify the combination. 

    ASSESSMENT CRITERION 4 
    Timing diagrams are drawn from a combination of logic gates and explained in terms of their state at different time intervals. 

    SPECIFIC OUTCOME 3 
    Demonstrate an understanding of the electrical behaviour and handling of CMOS devices. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The basic 74LS series of integrated circuits are described in terms of their internal configuration and pin lay out. 

    ASSESSMENT CRITERION 2 
    The manufacturer's data sheets for basic logic families are interpreted in terms of their electrical characteristic. 

    SPECIFIC OUTCOME 4 
    Use Boolean algebra to simplify basic combinational circuits. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    The five basic Boolean algebra theorems using one variable are performed on basic two input logic gates. 

    ASSESSMENT CRITERION 2 
    Basic truth tables are simplified using Boolean algebra. 


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Any institution offering learning that will enable achievement of this Unit Standard and the related Exit Level Outcomes of the Qualification must be accredited by the relevant ETQA.
  • External Moderation of assessment will be overseen by the relevant ETQA at its discretion.
  • The accredited Training Provider will oversee internal moderation of assessment.
  • Internal and external moderation should encompass achievement of competence described in this Unit Standard as well as the integrated competence described in the Exit Level Outcome of the Qualification.
  • Moderators should be in possession of a Qualification in Electronics at a minimum of NQF Level 4. 

  • UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
  • Electrical principles.
  • Electrical components.
  • Circuits. 

  • UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Identifying and solving problems using creative thinking processes by interpreting and applying specific elements, number systems and measurements when constructing circuits. 

    UNIT STANDARD CCFO WORKING 
    Working effectively with others as a member of a team or group to ensure that joint projects are constructed in an integrated manner. 

    UNIT STANDARD CCFO ORGANISING 
    Organising and managing oneself and one's activities responsibly when working with circuits to ensure that handling precautions are applied to own work context. 

    UNIT STANDARD CCFO COLLECTING 
    Collecting, analysing, organising and critically evaluating information in order to effectively interpret the basics of digital electronics as it applies in own works. 

    UNIT STANDARD CCFO SCIENCE 
    Using science and technology effectively and critically, showing responsibility to the environment and health of others in ensuring that information pertaining to digital electronics is used correctly. 

    UNIT STANDARD CCFO DEMONSTRATING 
    Demonstrating an understanding of the world, as a set of related systems by understanding that digital electronics do not exist in isolation but are affected by new developments and advancements in the electronics environments. 

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    N/A 

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  67569   National Certificate: Electronics Manufacturing and Assembly  Level 2  NQF Level 02  Passed the End Date -
    Status was "Reregistered" 
    2015-06-30  MERSETA 
    Core  59569   National Certificate: Electronics  Level 3  NQF Level 03  Reregistered  2023-06-30  MICTS 
    Core  67609   National Certificate: Mechatronics  Level 3  NQF Level 03  Reregistered  2023-06-30  MERSETA 
    Core  65650   Further Education and Training Certificate: Sewing Machine Mechanics  Level 4  NQF Level 04  Passed the End Date -
    Status was "Reregistered" 
    2015-06-30  FPMSETA 


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    1. Aranda Learnership College (Pty) Ltd 
    2. BMW SA (Pty) Ltd (ROSSLYN) (TP) 
    3. Cape Peninsula University of Technology 
    4. Eastcape Midlands Public FET College - Uitenhage (High Street)Campus 
    5. MARKET DEMAND TRADING 597 PTY LTD 
    6. Sew Africa Training Centre 
    7. Siemens Ltd (HALFWAY HOUSE) (TP) 
    8. Tekmation (Pty) Ltd T/A Tekmation Training Institute (DURBAN) (TP) 
    9. THANDEKA VOCATIONAL EDUCATION TRUST (PTY) LTD 
    10. THE SAJ COMPETENCY TRAINING INSTITUTE CC 
    11. Toyota Academy Toyota SA Motors (Pty) Ltd (ISIPINGO) (TP) 
    12. Volkswagen of South Africa (Pty) Ltd - Technical Learning Academy (UIT 
    13. Wavelength T.T.I 



    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.